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.Dd October 28, 2017
.Dt QUOTACTL 4I
.Os
.Sh NAME
.Nm quotactl
.Nd manipulate disk quotas
.Sh SYNOPSIS
.In sys/fs/ufs_quota.h
.Fn "int ioctl" "int fd" "Q_QUOTACTL" "struct quotctl *qp"
.Sh DESCRIPTION
This
.Fn ioctl
call manipulates disk quotas.
.Fa fd
is the file descriptor returned by the
.Xr open 2
system call after opening the
.Pa quotas
file (located in the root directory of the filesystem running quotas).
.Dv Q_QUOTACTL
is defined in
.Pa /usr/include/sys/fs/ufs_quota.h .
.Fa qp
is the address of the
.Vt quotctl
structure which is defined as
.Bd -literal -offset 2n
struct quotctl {
  int op;
  uid_t uid;
  caddr_t addr;
};
.Ed
.Pp
.Fa op
indicates an operation to be applied to the user
.Sy ID
.Fa uid .
.Po
See below.
.Pc
.Fa addr
is the address of an optional, command specific, data
structure which is copied in or out of the system.
The interpretation of
.Fa addr
is given with each value of
.Fa op
below.
.Bl -tag -width Q_GETQUOTA
.It Sy Q_QUOTAON
Turn on quotas for a file system.
.Fa addr
points to the full pathname of the
.Pa quotas
file.
.Fa uid
is ignored.
It is recommended that
.Fa uid
have the value of
.Sy 0 .
This call is restricted to the super-user.
.It Dv Q_QUOTAOFF
Turn off quotas for a file system.
.Fa addr
and
.Fa uid
are ignored.
It is
recommended that
.Fa addr
have the value of
.Sy NULL
and
.Fa uid
have the value of
.Sy 0 .
This call is restricted to the super-user.
.It Dv Q_GETQUOTA
Get disk quota limits and current usage for user
.Fa uid .
.Fa addr
is a pointer to a
.Vt dqblk
structure
.Po
defined in
.In sys/fs/ufs_quota.h
.Pc .
Only the super-user may get the quotas of a user other than himself.
.It Dv Q_SETQUOTA
Set disk quota limits and current usage for user
.Fa uid .
.Fa addr
is a pointer to a
.Vt dqblk
structure
.Po
defined in
.In sys/fs/ufs_quota.h
.Pc .
This call is restricted to the super-user.
.It Dv Q_SETQLIM
Set disk quota limits for user
.Fa uid .
.Fa addr
is a pointer to a
.Vt dqblk
structure
.Po
defined in
.In sys/fs/ufs_quota.h
.Pc .
This call is restricted to the super-user.
.It Dv Q_SYNC
Update the on-disk copy of quota usages for this file system.
.Fa addr
and
.Fa uid
are ignored.
.It Dv Q_ALLSYNC
Update the on-disk copy of quota usages for all file systems with active
quotas.
.Fa addr
and
.Fa uid
are ignored.
.El
.Sh RETURN VALUES
This
Fn ioctl
returns:
.Bl -tag -width xx
.It Sy 0
on success.
.It Sy \(mi1
on failure and sets
.Va errno
to indicate the error.
.El
.Sh FILES
.Bl -tag -width x
.It Pa /usr/include/sys/fs/ufs_quota.h
quota-related structure/function definitions and defines
.El
.Sh ERRORS
.Bl -tag -width EFAULT
.It Er EFAULT
.Fa addr
is invalid.
.It Er EINVAL
The kernel has not been compiled with the
.Sy QUOTA
option.
.Fa op
is invalid.
.It Er ENOENT
The
.Pa quotas
file specified by
.Fa addr
does not exist.
.It Er EPERM
The call is privileged and the calling process did not assert
.Brq Sy PRIV_SYS_MOUNT
in the effective set.
.It Er ESRCH
No disk quota is found for the indicated user.
Quotas have not been turned on for this file system.
.It Er EUSERS
The quota table is full.
.El
.Pp
If
.Fa op
is
.Dv Q_QUOTAON ,
.Fn ioctl
may set
.Va errno
to:
.Bl -tag -width EACCES
.It Er EACCES
The quota file pointed to by
.Fa addr
exists but is not a regular file.
The quota file pointed to by
.Fa addr
exists but is not on the file system pointed to by
.Fa special .
.It Er EIO
Internal I/O error while attempting to read the
.Pa quotas
file pointed to by
.Fa addr .
.El
.Sh SEE ALSO
.Xr getrlimit 2 ,
.Xr mount 2 ,
.Xr quota 8 ,
.Xr quotacheck 8 ,
.Xr quotaon 8
.Sh BUGS
There should be some way to integrate this call with the resource limit
interface provided by
.Xr setrlimit 2
and
.Xr getrlimit 2 .
.Pp
This call is incompatible with Melbourne quotas.
